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- Volume 29, Issue 12, 2011
First Break - Volume 29, Issue 12, 2011
Volume 29, Issue 12, 2011
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UK tests the limits for shale gas exploration
Drilling for shale gas in NE England has sparked controversy and a debate likely to be followed closely by the oil and gas industry, regulators, environmentalists, and affected local communities around the world. First Break reports.
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Time to retool the future of seabed monitoring and surveillance
More LessBjarte Fagerås believes the current technology path for developing permanent reservoir monitoring systems needs to be challenged with rapid implementation of a more radical solution drawing upon the experience of other industries with a better record of timely innovation.
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Autonomous marine seismic technology explained
Authors Chris Walker and Steve McIntoshChris Walker and Steve McIntosh describe the operational details of ocean bottom node seismic acquisition, an option beginning to find favour with oil company E&P departments.
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Ocean bottom seismic: strategic technology for the oil industry
More LessKim Gunn Maver illustrates how ocean bottom seismic methods (with the emphasis on OBC) provide improved seismic imaging compared with towed streamer seismic methods for certain applications and can be expected to benefit from increased industry take-up in the future.
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An acquisition system that extracts the earth response from seismic data
Authors Gregg Parkes and Stian HegnaGregg Parkes and Stian Hegna focus on new developments in source technology for marine seismic acquisition aimed at removing all the acquisition-related effects.
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Uses of wide-azimuth and variable-depth streamers for sub-basalt seismic imaging
Authors Robert Dowle, Fabrice Mandroux, Robert Soubaras and Gareth WilliamsTo evaluate the optimal technique for imaging beneath a complex basalt layer, Robert Dowle, Fabrice Mandroux, Robert Soubaras and Gareth Williams compare dense wide-azimuth and broadband towed streamer acquisition solutions when deployed in an experimental survey in the Faroe-Shetland Basin.
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A singular value decomposition algorithm for the attenuation of high energy towed-streamer noise
More LessNick Moldoveanu introduces a method to attenuate high energy towed-streamer noise which has been applied successfully in the processing of a variety of surveys in the Gulf of Mexico and Brazil which employed different acquisition techniques.
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Palaeogene remobilized sandstones of the Central North Sea – implications for hydrocarbon migration
Authors S.D. Murphy and P.H. WoodThere are abundant examples of remobilized sandstones in the Central and Northern North Sea. Study of an area around the Chestnut Field reveals two distinct Eocene sandstone formations, the Caran and Nauchlan, which both show evidence of remobilization. Following a review of the developed and undeveloped discoveries in this area, a trend emerged between these Palaeogene plays. Seemingly robust Palaeocene structures with tested reservoir, on a known hydrocarbon migration route with overlying seal rocks, were found to be dry where they were overlain by Caran injectites. Elsewhere this same geometry results in hydrocarbons being trapped, but only when overlying Caran injectites are absent. It seems that there is a mutually exclusive relationship between Palaeocene dip-closed structures and overlying injectites. We infer that Caran injectites permit migration into the overlying Nauchlan fairway where hydrocarbons migrate up dip and charge Eocene traps, such as the Chestnut Field. These observations are backed by extensive well data, seismic mapping, fairway mapping, and pressure data. This mutually exclusive relationship may be restricted to areas where an overlying Eocene fairway acts as a migration pathway. Elsewhere these remobilized sands are encased in mudrocks, resulting in hydrocarbons being trapped in Palaeocene structures and associated injectites.
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Diffraction imaging as an interpretation tool
Authors Constantine Tsingas, Bouchaib El Marhfoul, Sara Satti and Abdulfattah DajaniIn naturally fractured reservoirs, detailed mapping and understanding of the subsurface fracture network is necessary to optimize field development. There are a variety of seismically driven technologies for mapping and detecting fracture zones. For example, by investigating seismic anisotropy one can hope to obtain preferential fracture orientation. Moreover, by generating and extracting volume and/or horizon-based attributes, potential fracture corridors can be identified and mapped. In this work we present an imaging technology that focuses diffraction energy produced by sharp discontinuities and at the same time suppresses specular reflection arrivals. The diffraction-enhanced seismic sections assist and contribute significantly in the interpretation and identification of small-scale faults and fractures, and they are used in addition to other derived post-stack attributes such as coherency and curvature cubes. We describe the diffraction imaging methodology and illustrate its application using synthetic and real data examples. We also show the ability of the technique to map fracture swarms by focusing the associated diffracted energy in the pre-stack time domain.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)